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Review reviewHigh

CVE-2025-68206

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: add seqadj extension for natted connections Sequence adjustment may be required for FTP traffic with PASV/EPSV modes. due to need to re-write packet payload (IP, port) on the ftp control connection. This can require changes to the TCP length and expected seq / ack_seq. The easiest way to reproduce this issue is with PASV mode. Example ruleset: table inet ftp_nat { ct helper ftp_helper { type "ftp" protocol tcp l3proto inet } chain prerouting { type filter hook prerouting priority 0; policy accept; tcp dpo...

CVSS
7.5
EPSS
0.61%
46.1% percentile
CISA KEV
Not listed
Published
2025.12.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.61%
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: add seqadj extension for natted connections Sequence adjustment may be required for FTP traffic with PASV/EPSV modes. due to need to re-write packet payload (IP, port) on the ftp control connection. This can require changes to the TCP length and expected seq / ack_seq. The easiest way to reproduce this issue is with PASV mode. Example ruleset: table inet ftp_nat { ct helper ftp_helper { type "ftp" protocol tcp l3proto inet } chain prerouting { type filter hook prerouting priority 0; policy accept; tcp dpo...

Affected product and versions

Product
Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Affected versions
>= 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 < 83273af0b60c093ba0085c205864d8542e1b1653, >= 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 < b19492c25eff04852e0cb58f9bb8238b6695ed2d, >= 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 < 4de80f0dc3868408dd7fe9817e507123c9dd8bb0, >= 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 < b477ef7fa612fa45b6b3134d90d1eeb09396500a, >= 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 < 4ab2cd906e4e1a19ddbda6eb532851b0e9cda110, >= 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 < 2b52d89cbbb0dbe3e948d8d9a91e704316dccfe6, >= 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 < 90918e3b6404c2a37837b8f11692471b4c512de2, >= 4.12, >= V3.1.6, >= V3.1.5
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available